Cylinder lock



Oct. 14, 1952 J. E. SALMIVUORI 2,613,528

CYLINDER LOCK Filed Feb. 24, 3.948

2 SHEETS-SHEE'I 1 Oct. 14, 1952 Filed Feb. 24, 1948 2 Ti r 33 4 T J. E.SALMIVUORI 2,613,528 CYLINDER LOCK 2 SHEETS-SHEET 2 FIE. ll

Patented Oct. 14, 1952 CYLINDER LocK i Johannes Erkki Salmivuori,Helsingfors, Finland, assignor to Aktiebolaget Addo, Malmo, Sweden,

a corporation of Sweden Application February 24, 1948, Serial No; 10,331

I In Finland February 7, 1947 Section 1, Public Law 690, August 8, 1946Patent expires February 7, 1967 12 Claims.

This invention relatesto an improvement in cylinder locks of a knowntype, whereby the safety of the lock is considerably increased and amethodical picking of the lock is thus rendered substantiallyimpossible.

The known type of cylinder locks comprises tumblers in the form ofcircular disks rotatably inserted in a lock barrel which in turn isrotatably inserted in a cylindrical bore in the casing. The barrel has alongitudinal slot in which a radially movable tumbler bar is disposed,which bar is received, in looking position, in a longitudinal lockinggroove inlthe casing and thus prevents rotation of thelbarrel in saidcasing. Each disk has a recess in its periphery and by means of a keythat is introducedinto a central key hole passing through all disks,they can be rotated into a position in'which their recesses are alignedand form a' continuous openinggroove for partly receiving the tumblerbar which is thereby released from'the casing and instead locks togetherthe barrel with all disks so that the barrel and the disks may berotated for opening of the lock. The radial parallel displacement of thetumbler bar is caused by a tangential force by means of a wedging actionbetween the wedge surfaces of the bar and the locking groove and thedisk recesses;

Locks of this type" may be picked by causing a tangential force to actupon the barrel, so that the tumbler bar is pressed by said wedgingaction against the periphery of the disks, whereafterwthe disks arerotated one at a time by means of a suitable tool 'until'it can be feltthat the friction against the'bar ceases and the recess of the disk thusregisters with the bar.

The principal object of the invention is to provide alock of the kindreferred to, which comprises a plurality of tumbler bars andcorresponding locking grooves and opening recesses and in which only onetumbler bar at a time can be brought into bearing contact with thetumbler disks when the "lock is locked, whereby picking of the lock inthe indicated manner is prevented.

Another object of the invention is to construct a lock of the kindreferred to, comprising more than one tumbler bar, in such a way thatwhen a tumbler bar has been brought into opening position by picking,the tumbler disks are fixed in relation to each other and to the barrelso as not to be individually adjustable in relation to another tumblerbar.

A further object of the invention is to provide a lock having tumblerdisks with blind recesses 2 of the same size and form as the openingrecesses so that a tumbler bar can be brought by picking into openingposition by being introduced into both opening and blind recesseswithout indicating which of the recesses are blind ones.

Still another object of the invention is to provide the differenttumbler bars with positionmg extensions fitting into correspondingrecesses in connection with the locking grooves, so that each tumblerbar can be moved into a determined groove only.

A still further object of the invention is to provide means for holdingthe tumbler bars parallel to the axis of the barrel and for preventinglongitudinal movement of the tumbler bars.

Further objects and advantages of the invention will appear from thefollowing description of two embodiments of the invention, referencebeing had to the accompanying drawings in which:

Fig. 1 is an axial section through the first emgodirgient of theinvention, taken on line II in Fig. 2'is an axial section on line IIIIin Fig. 3.

Fig. 3 is an end view. as seen from the left according to Figs. 1 and 2.

Figs. 4 and 5 are crosssections on line IV-IV in Fig. 1, showing thelock in locked and opened position, respectively.

Fig-6 is a similar cross section of the lock in another locking positionthat may occur when it Iins tried to pick the lock.

ig. 7 shows a detail in cross VH VH in Fig. 1. section on line Fig. 8 isa cross section similar to Fig. 7, but showing the parts in anotherposition.

Figs. 9 and 10 show a modification partly in axial section along linescorresponding to lines IIX and II-II in Fig. 3, respectively.

Fig. 11 shows a washer.

Fig. '12 shows a side view of the key of ,the'lock.

Fig. 13 shows the key ofthe lock-in cross section on'line XIII-XIII inFig. 12.

Figs. 14 and 15 show partly in axial sections corresponding to Figs. 1and 2. another embodi ment of the invention.

Fig. 16 shows a detail in cross s a XVI-XVI in Fig. 14. echo Fig-17 is across section similar to Fig- 16, but showing the parts in anotherposition.

Referring to the drawings, in the first-embodiment shown in Figs. 1 .to.13 the lock according to the invention comprises a casing llwith acylindrical. here which is completely open at the rear butis closed atits front end by means of an tained in the casing by a disk I which isattached.

by means of a screw 8 to the rear end of .the

casing and which is slotted at its one side so as to form a click spring9 adapted to .engage a notch ID in the end wall of the barrel in orderto stop the barrel in a certain position on turning it in lockingdirection. The disk I hasa suitable hole I I for the coupling means 6.

Alternating with washers I3 there is inserted in the barrel 4 a numberof tumbler disks [2- (in the present case ten) rotatably fitting in thebarrel. each comprise a projection I4 engaging a wide longitudinal slotI5 inthe barrel 4, so that the diskscannot be rotated in relation to thebarrel.

Furthermore, the washers have a'centrfalhole I 6 permitting thekeypertaining to the lock freely to pass therethrough, and a 'recess. il'attheir periphery for a purpose to be indicatedin. the

following. Thetumbler disks IZare all provided with a central key holein the form of acircle sector having a centre angle-ofpreferably atleast 180". The radial edges of the key holes of the'tumbler disks formabutments for the key when opening and closing the.lock,v respectively.

'I he key "(Figs 12 and-13,) is inthe. form-of a numberjof coaxialsectors I8 laid after each other an'd'each forming ,abutments for atumbler disk,

and. as all sectors have diiferent .centre angles the key whenintroduced into the closed lock and L'turnedfin ,opening direction, inthe present case in clockwise direction, successivelyzacts upon alltumbler disks causing them to occupy a determined-positionin relation toeach other and to the other parts of the look. In this position two setsof opening recesses a primary one I9, and a secondary one 25,provided'in the tumbler disks .ar'e'each. brought into alignment witheach other r (Fig. 5), so as to form two continuouslongitudinalopeninggrooves. .The barrel .4 has two longitudinal slotis2i and '22 and'the'inside of. the 'casing has two longitudinal lockinggrooves. 23

and 2,4.at the same mutual-angular spacing as Itherecesses I9l andofzthe tumbler disks. In 'each of the slots 2| and 22 of the barrelthereis ,placed a longitudinal tumbler bar 25 and 26, re-

to be partlyreceived, in opening position (Fig. 5), within acorresponding opening groove formed by thev opening recesses -ofthetumbler disks, whereby said bar .locks the tumbler disks in the barrelbut leaves thelatter free in relation-to the casing so that the lock maybeopened.

'Ihe movement of the tumbler bars 25, 26, which is made possible thanksto the recesses I I of the washers I3, is realizedby tangential pressurefrom the barrel 4 or the tumbler disks I2. Thelocking grooves 23 and 24,of thecasingas well as the recesses I9 and 20 of the Itumblerdisks-eachhave one of their sides inclined, in relation to the Ia'di'usand thetumbler bars have wedge surfaces at their corresponding'sides, soastoc'o-operate when opening and closing the lock with the inclined sideslike wedges. When opening the lock Said washers I3 being shown in Fig.1

4. the tumbler bars are thus pressed by the barrel against the inclinedsides of the locking grooves of the casing and are thereby moved out ofsaid grooves and into the opening recesses of the tumbler disks; whileupon locking the inclined sides of the opening recesses of the tumblerdisks press the tumbler bars outwardly into locking position in thelocking grooves of the casing.

For rotation of the barrel 4 in the casing I at least one of the tumblerdisks I2 comprises a pin 21: projecting from the periphery of the diskinto the wides'lotl 5 of the barrel to act upon an edge of the slotafter a certain rotation of the disk.

Thepin isdisposed so as to strike the slot edge, upon opening, at thesame moment as the opening recesses I9 and 20, respectively, of thetumbler disk are aligned with each other, so that upon diately .causedto. press the, tumbler bars outwardl'y so that the latter as soon asthey register with theirrespective locking grooves in the casing, fallinto said grooves and lock the barrel, whichtakes place simultaneouslywith the click spring 9 engaging the notch I0 and stopping the barrel.In order that. the key, may be taken out itmust be further. turned, itslocking abutment, consisting of aplanesurface 28, collecting all tumblerdisks oneat a tim and bringing their key; holes to register, which takesplace at the same time as the pin 2'I-- strikes the edge of the slot I5and thus prevents any continued turning. The tumblerbars 25 and 26 areformed so as to be able only to fall into their proper locking grooves23and 24, respectively, in the casin I. For this purpose they may beprovided at either end, or both ends with lateral extension 29 and 30,respectively, projecting, in opposite directions and fittingincorresponding recesses 3| in connection with the corresponding lockinggrooves, or the bars and also the-locking grooves may be of difierentlengths, as shown in Fig. 10. In the latter case the shorter bar 25 isanchored, preferably by means of a radial pin 32, in a bore 33 in thebarrel so as not to be displaceable longitudinally. Combinations of botharrangements may also be suitable. r

In order to prevent the possibility of picking the lock in the mannerindicated in the introduction, at least some of the tumbler disks I 2are each provided with one or more blind or misleading recesses 3.4which may be of the same size and form asthe opening recesses I9 and 20.Said blind recesses, of course, per se make the picking of the lookmoredifiicult, but the invention, furthermore comprises a new arrangementmaking the picking. of the lock practically impossible and involvingthat, in locking position, the tumbler bars cannot be simultaneouslypressed against the tumbler disks.

In the first embodiment of the invention this is realized simply by thefact that the locking grooves 23,. 24 of the casing and the tumbler bars25,26 are so dimensioned in relation to each other that,.in ordinarylocking position (Fig. 4), only one bar 25 which is here called theprimary bar, positivel locks the barrel 4 in the casin I, while thesecondarybar ZB-has a certain clearance in its groove 24. As a resultthereof, the tumbler disks can each be adjusted, without the aidof theproper key, into opening position only in relation to the primarytumbler bar 25; since the secondary bar26 cannot be caused to-exertpressure on and thus friction against the tumbler disks. The primary bar25 can, however, be

brought into opening position, but then the situa- 29 in eachtumblerw'disk have the same mutual angular spacing as the slots 2 I, 22of the barrel 4.

In this situation the secondary tumbler bar-.26

may be pressed against the tumbler disks; it is true, but now the latterare locked in relation to each other and the barrel and "thus. cannot beadjusted individually.

In the second embodimentshown in Figs.-l4-

to 17, the two tumbler bars 25b, 26b and'their locking grooves 23, 24may be of such dimensions that the two bars simultaneously positivelylock the barrel 4 in the casing 1 However, the primary tumbler bar 251)here has an'arm '35 which extends along the periphery of the barrel andalways underlies the secondary tumblerb ar 26b and in normal lockingposition holds the latter free from the tumbler disks-but when theprimary tumbler bar 25b falls into openin position, said arm permits thesecondary tumbler bar 2611 also to fall into openingposition. On theother hand, in opening position the secondary tumbler bar 261) holds theprimary tumbler bar 25?) pressed in, so that the latter cannot be movedout into locking position before the secondarybar. Thereby the primarybar 251') is prevented from falling into the wrong locking groove if thetumbler bars are placed in suchrelationship that onturni'ng the barrelin locking direction the primary tumbler bar 251) must pass thesecondary-locking groove 2 1 before it'reaches its proper-docking groove23, The arm 35 is provided at its-free end with a pivot 36 parallel tothe 'tumbler bar and rotatably mounted in the barrel, said;"pivotforming a fulcrum for the tumbler bar 2519 in its movements and holdingit correctly positioned. The secondary tumbler bar-26b is preferably ina similar manner pivotally mounted and guided in the barrel by means ofa"t1'ansverse arm 3! and apivot 3B.

The invention is not'limitedto the embodi ments thereof described aboveand shown in the drawings, for said embodiments may be modified indifferent ways without departing from the scope of the appended claims.Thus, the tumbler disks may be'of any suitable number, and the lock maybe provided, if desired, with three or more tumbler bars with pertainingrecesses, slots and grooves, whereby "the safety of the lock is furtherincreased. v

What I claim and desire to secure by Letters Patent is:

1. A cylinder lock operable by a'key, comprising a casing having acylinder bore and a plurality of longitudinal locking grooves in itsinner wall, a lock barrel in said bore having longitudinal slotscorrespondingto said locking grooves, a plurality of circular tumblerdisks independently rotatable in said barrel and having opening recessesat their edges corresponding to said locking grooves and said slotsandadapted to be aligned for forming continuous opening grooves onrotating said, disks by said key for opening the lock, saiddisks alsohavingblind recesses, a radially movable, longitudinaltuni- 1 bler barhaving wedge shaped surfaces thereon in each of saidbarrel slots, eachof said'tumbler bars in locking position being partly received in acorresponding one of 'said.;locking grooves to prevent rotation of saidbarrel in relation to said casing and in opening position being partly.-received in a correspondingv one of said opening grooves for releasingsaid barrel in relation to :said casing and locking said tumbler disksin relation' to eachother and to said barrel, said locking grooves andsaid longitudinal slots each having one side thereof inclined withrespect to theradius of the lock and together with the wedgeshapedsurfaces of said tumbler bars forming wedge means for forcing saidtumbler bars radially inwards and outwards by said barrelv or said disksbeing actuated by the key, and supporting means coacting with'saidtumbler bars for preventing one of said tumbler bars from being forcedby said wedge means against said tumbler disks when another. ofsaidtumbler bars is in its locking position.

2. A cylinder lock-operable by a key, comprising a casing having acylinder bore and a plurality of longitudinal locking grooves in itsinner wal1,'a 'lock barrel in said bore having longitudinalslotscorresponding to said. locking grooves, a plurality of circulartumblerdisks independently rotatable in said barrel'and having openingrecesses at their edges corresponding to' said locking grooves and saidslots and adapted to be aligned for forming :continuous opening grooveson rotating said disks by saidkey for opening the -lock,- said .disksalso having blind recesses, a radially movable, longitudinal tumbler barhaving wedge shaped surfaces thereon in each of said barrel slots, eachof said tumbler bars in looking positions being partly received inacorrespondingone of said locking grooves to prevent rotation-of saidbarrel in relation to said casing and ;in opening position beingpartlyreceived in a corresponding one of said opening grooves forreleasing said barrel in relation to said casingand locking said tumbler.disks in relation to each other and to'said barrel, positioning meansincluding extensions on said tumbler bars, said lock-ingrgmoves havingcorresponding recesses therein, said positioning-means being adapted tobe received in said corresponding recesses in said locking grooves, sothat each of said tumbler bars can be partly received only initscorresponding locking grooves,-said locking grooves and saidlongitudinal slots each having one side thereofinclined with respect tothe radius of the lock and together with the Wedge shaped surfaces ofsaid tumbler bars forming wedge means for forcing said tumbler barsradially inwards and outwards by said barrel or said disks beingactuatedby the key, and supporting means coacting with said tumbler barsforpreventing one of said tumbler bars from being forced by said wedgemeans against said tumbler disks when another of said tumbler bars is in.its locking'position.

3. A cylinder lock-operable by "a key, comprising a casing havinga-cylinder bore and a primary longitudinallocking groove and a secondarylongitudinal locking groove, in its inner wall, a lock barrel'in saidbore having a primary longitudinal slot and a secondary longitudinalslot corresponding to said locking grooves, a plurality of circulartumblerv disks independently-rotatable in said barrel and each having aprimary opening recess. and. a secondary open-'- 7 ing recesscorresponding to said locking grooves and said slots and adapted to bealigned for forming two continuous opening grooves on rotating saiddisks by the proper key for opening the lock, the disks also havingblind recesses, a primary tumbler bar in said primary barrel slot and asecondary tumbler bar in said secondary barrel slot, wedge meansincluding'wedge surfaces in said locking grooves and said tumbler diskrecesses and on said tumbler bars for forcing said bars radiallyoutwards into locking position, in which said barrel is locked in saidcasing, or radially inwards into opening position, in which saidbarrelis released from said casing and said tumbler disks are locked inrelation to each other and to said barrel, said secondary locking groovebeing dimensioned to provide a clearance space between said wedgesurfaces of said secondary locking groove and said secondary tumblerbar, so that said secondary bar can be forced inwards into engagementwith said tumbler disks only when said primary tumbler bar is in openingposition releasing said barrel and locking said tumbler disks.

slot and a secondary longitudinal slot corresponding to said'lockinggrooves, a plurality of circular tumbler disks independently rotatablein said barrel and each having a primary opening recess and a secondaryopening recess corresponding to said locking grooves and said slots andadapted to be aligned for forming two continuous opening grooves onrotating said disks by the proper key for opening the lock, the disksalso having blind recesses, a primary tumbler bar in said primary barrelslot and a secondary tumbler bar in said secondary barrel slot, wedgemeans including wedge surfaces in said locking grooves and said tumblerdisk recesses and on said tumbler bars for forcing said bars radiallyoutwards into locking position, in which said barrel is locked in saidcasing, or radially inwards into opening position, in which said barrelis released from said casing and said tumbler disks are locked inrelation to each other and to said barrel, said secondary locking groovebeing I dimensioned to provide a clearance space between said wedgesurfaces of said secondary locking groove and said secondary tumblerbar, so that said secondary bar can be forced inwards into engagementwith said tumbler disks only when said primary tumbler bar is in openingposition releasing said barrel and locking said tumbler disks, andguiding means for keeping said tumbler bars parallel with the axis ofsaid barrel and preventing longitudinal movement of one of said tumblerbars including a radial pin on said one tumbler bar and a radial bore insaid barrel, said pin being anchored insaid radial bore in 'said barrel.

5. A cylinder lock operable by-a key, comprising a casing having acylinder bore and a primary longitudinal locking groove and 'a secondarylongitudinal locking groove in its inner wall, a lock barrel in saidbore having a primary longitudinal slot and a secondary longitudinalslot corresponding to said locking grooves, a plurality of circulartumbler disks independently rotatable in said barrel and each having aprimary opening recess and a secondary opening recess corresponding tosaid locking grooves and said slots and adapted to be aligned forforming two continuous opening grooves on rotating said disks by theproper key for opening the lock, the disks also having blind recesses, aprimary tumbler bar insaid primary barrel slot and a secondary tumblerbar in said secondary barrel slot, wedge means including wedge surfacesin said locking grooves and said tumbler disk recesses and on saidtumbler bars for forcing said bars radially outwards into lockingposition, in which said barrel is locked in said casing, or radiallyinwards into opening position, in which said barrel is released fromsaid casing and said tumbler disks are locked in relation to each otherand to said barrel, and a lateral arm on said primary tumbler barunderlying said secondary tumbler bar and keeping it out of engagementwith said tumbler disks when said primary tumbler bar is in lookingposition and preventing said primary tumbler bar from moving intolocking position whensaid secondary tumbler bar is in opening position.

6. A cylinder lock operable by a key, comprising a casing having acylinder bore and a primary longitudinal locking groove and a secondarylongitudinal locking groove in its inner wall, a lock barrel in saidbore having a primary longitudinal slot and a secondary longitudinalslot corresponding to said locking grooves, a plurality of circulartumbler disks independently rotatable in said barrel and each having aprimary opening recess and a secondary opening recess corresponding tosaid locking grooves and said slots and adapted to be aligned forforming two continuous ODening grooves on rotating said disks by theproper key for opening the lock, the disks also having blind recesses, aprimary tumbler bar in said primary barrel slot and a secondary tumblerbar in said secondary barrel slot, wedge means including wedge surfacesin said locking grooves and said tumbler disk recesses and on saidtumbler bars for forcing said bars radially outwards into lockingposition, in which said barrel is locked insaid casing, or radiallyinwards into opening position, in which said barrel is released fromsaid casing and said tumbler disks are locked in relation to each otherand to said barrel, a lateral arm on said primary tumbler bar underlyingsaid secondary tumbler bar and keeping it out of engagement with saidtumbler disks when said primary tumbler bar is in looking position andpreventing said primary tumbler bar from moving into locking positionwhenesaid secondary tumbler bar is in opening position, a lateral arm onsaid secondary tumbler bar, and longitudinally extending pivots on saidlateral arms rotatably mounted in longitudinal bores in said barrel tokeep said tumbler bars parallel with the axis of said barrel and preventlongitudinal movement of said tumbler bars.

7. A cylinder lock operable by a key, comprismg a casing having acylinder bore and a plurality of longitudinal locking grooves in itsinner wall and a cam surface forming one side of each locking groove, alock barrel in said bore having longitudinal slots corresponding to saidlocking grooves, a plurality of tumbler disks independently rotatable insaid barrel and having opening recesses so positioned at the edges ofthe disks as to be aligned for forming a continuous opening groovebehind each of said barrel slots on rotating said disks by said key inopening direction and having one edge fashioned to form a cam surface ineach opening groove, a radially movable longitudinal tumbler bar in 9each of said barrel slots, which'in locking position is partly receivedin a corresponding one of said locking grooves to prevent rotation ofsaid barrel in relation to said casing and in opening position partlyreceived in a corresponding one of said opening grooves for permittingrotation of said barrel in relation to said casing and preventingrotation of said tumbler disks in relation to each other and to saidbarrel, each tumbler bar having a cam surface for cooperation with saidcam surfaces in said locking grooves and said opening grooves to forceeach tumbler bar into opening and locking position, respectively, onrotation of said disks in opening or closing direction, and supportingmeans for preventing one of said tumbler bars from being forced radiallyinward by said cam surfaces when another of said tumbler bars is inlooking position. r

8. A cylinder lock operable by a key, comprising a casing having acylinder bore and a plurality of longitudinal locking grooves in itsinner Wall and a cam surface forming one side of each locking groove, alock barrel in said bore having longitudinal slots corresponding to saidlocking grooves, a plurality of tumbler disks independently rotatable insaid barrel and having opening recesses so positioned atthe edges of thedisks as to be aligned for forming a continuous opening groove behindeach of said barrel slots on rotating said disks by said key'in openingdirection and having one edge fashioned to form a cam surface in eachopening groove, a radially movable longitudinal tumbler bar in each ofsaid barrel slots, which in looking position is partly received inacorresponding one of said locking grooves to preventrotation of saidbarrel in relation to said casing and in opening position partlyreceived in a corresponding one of said opening grooves for permittingrotation of said barrel in relation to said casing and preventingrotation of said tumbler disks in relation to each other and to saidbarreLeach tumbler bar having a cam surface for cooperation with saidcam surfaces in said locking grooves and said opening grooves to forcesaid tumbler bar into opening and locking position, respectively, onrotation of said disks in opening or closing direction, positioningmeans including extensions on said tumbler bars adapted to be receivedin corresponding recesses in connection with said locking grooves andpermitting each of said tumbler bars to be partly received only in itscorresponding locking groove, and supporting means for preventing one ofsaid tumbler bars from being forced radially inwards by said camsurfaces when another of said tumbler bars is in looking position.

9. A cylinder lock operable by a key, comprising a casing having acylinder bore and a primary longitudinal locking groove and a secondarylongitudinal locking groove in its inner wall, and a cam surface formingone side of each locking groove, a lock barrel in said bore having aprimary longitudinal slot and a secondary longitudinal slotcorresponding to said locking grooves, a plurality of tumbler disksindependently rotatable in said barrel and having each a primary and asecondary opening recess so positioned at the edges of the disks as tobe aligned for forming a continuous opening groove behind each of saidbarrel slots on rotation of said disks by said key in opening directionand having one edge fashioned to form a cam surface in each openinggroove, said disks also having blind reamazes cesses, a primary and asecondary tumbler bar'v in said primaryand secondary barrel slot, re-'spectively, which in locking position are partly received in saidprimary and secondary locking groove, respectively, to preventrotationof'said' barrel in relation to said casing andin' openingposition partly received in said primary and secondary opening groove,respectively, for permitting rotation of said barrel in relation'tosaidcasingand preventing rotationof said tumbler disksin' relation to eachother and to said bar} opening or closing direction, said secondarytum-' bler bar being so dimensioned in relation to said.

secondary locking groove as to leave in looking position a clearancespace between its camsurface and said cam surface in said lockinggroove, permitting said secondary tumbler bar, to be forced intoengagement with said tumbler disks only when said primary tumbler bar isin opening position releasing said barrel and locking said tumblerdisks.

10. A cylinder lock operable by a key, com-- prising a casing having acylinder bore and a primary longitudinal locking groove and a secondarylongitudinal locking groove in its inner wall, and a cam surface formingone side of each locking groove, a lock barrel in said bore having aprimary longitudinal slot and a secondary longitudinal slotcorresponding I to said locking grooves, a plurality of tumbler disksindependently rotatable in said barrel and having each a primary and asecondary opening recess so positioned at the edges of the disks as to,be aligned for forming a continuous opening groove behind each of saidbarrel slots on rotation of said disks by said key in opening directionand having one edge fashioned to form a cam surface ineach openinggroove, said disks also havingblindrecesses, a primary and asecondtumbler bar inv said primary and secondary barrel-slot, respectively,which in looking position are partly re-= ceived in said primary and,secondary lockinggroove, respectively, to prevent rotation of saidbarrel in relation to said casing and in opening position partlyreceived in said primary and secondary opening groove, respectively, forpermitting rotation of said barrel in relation to said casing andpreventing rotation of said tumbler disks in relation to each other andto said barrel, each tumbler bar having a cam surface for cooperationwith said cam surfaces in said locking grooves and said opening groovesto force said tumbler bars into opening and locking positionrespectively, on rotation of said disks in opening or closing direction,said secondary tumbler bar being so dimensioned in relation to saidsecondary locking groove as to leave in locking position a clearancespace between its cam surface and said cam surface in said lockinggroove, permitting said secondary tumbler bar to be forced intoengagement with said tumbler disks only when said primary tumbler bar isin opening position releasing said barrel and locking said tumblerdisks, and guiding means including a radial pin on each of said tumblerbars slidingly mounted in corresponding radial bores in said barrel tokeep said tumbler bars parallel with the axis of said barrel and preventlongitudinal movement of said tumbler bars.

11. A cylinder lock operable by a key, comprising a casing having acylinder bore and a primary longitudinal locking groove and a secondarylongitudinal locking groove in its inner wall, and a cam surface formingone said of each locking groo've, a lock barrel in said bore having aprimary longitudinalslot and a secondary longitudinal slot correspondingto said locking grooves, a plurality of tumbler disks independentlyrotatable in said barrel and having each a primary and a secondaryopening recess so positioned at the edges of the disks as to be alignedfor forming a continuous opening groovebehind each of said barrel slotson rotation of said disks by said key in opening direction and havingone edge fashioned to form a cam surface in each opening groove, saiddisks also having blind recesses, 21 primary and a secondary tumbler'bar in said primary and secondary barrel slot, respectively, which inlooking position are partly received in said primary and secondarylocking groove, respectively, to prevent rotation of said barrel inrelation to said casing and in opening position partly received in saidprimary and secondary opening groove, respectively, for permittingrotation of said barrel in relation to said casing and preventingrotation of said tumbler disks in relation to each other and to saidbarrel, each tumbler bar having a cam surface for cooperation with saidcam surfaces in said locking grooves and said opening grooves to forcesaid tumbler bars into opening and locking position, respectively, onrotation of said disks in opening or closing direction, and a lateralarm on said pri mary tumbler bar underlying said secondary tumbler barand keeping it out of engagement with said tumbler disks when saidprimary tumbler bar is in locking position and preventing said primarytumbler bar from moving into locking position when said secondarytumbler bar is in opening position.

12. A cylinder lock operable by a key, comprising a casing having acylinder bore and a primary longitudinal locking groove and a secondarylongitudinal locking groove in its inner wall, and a cam surface formingone side of each locking groove, a lock barrel in said bore having aprimary longitudinal slot and a secondary longitudinal slotcorresponding to said locking grooves,

a plurality of tumbler disks independently rotatable in said barrel andhavin each a primary and a secondary opening recess positioned at theedges of the disks as to be aligned for forming a continuous openinggroove behind each of said barrel slots on rotation of said disks bysaid key in opening direction and having one edge fashioned to form acam surface in each opening groove, said disks also having blindrecesses, a primary and a secondary tumbler bar'in said primary andsecondary barrel slot, respectively, which in looking position arepartly received in said primary and secondary locking groove,respectively, to prevent rotation of said barrel in relation to saidcasing and in opening osition partly received in said primary andsecondary opening groove, respectively, for permitting rotation of 'saidbarrel in relation to said casing and preventing rotation of saidtumbler disks in relation to each other and to said barrel, each tumblerbar having a cam surface for cooperation with said 'cam surfaces in saidlocking grooves and said opening grooves to force said tumbler bars intoop'ening and locking position respectively, on rotation of said disks inopening or closing direction, a lateral arm on said primary tumbler barunderlying said secondary tumbler bar and keeping it out of engagementwith said tumbler disks when said primary tumbler bar is in lookingposition and preventing said primary tumbler bar from moving intolocking position when said secondary tumbler bar is in openingpcsltion,'and a lateral arm on said secondary tumbler bar, andlongitudinally extending pivots on, said lateral arms mounted inlongitudinal bores in said barrel to keep said tumbler bars parallelWith'the axis of said barrel and prevent longitudinal movement of saidtumbler bars. I "JOHANNES ERKKI SALMIVUORI.

REFERENCES CITED UNITED STATES PATENTS Number Name Date 293,885 JacksonFeb. 19, 1884 2,217,047 "Fitz'Gera'ld' Oct. 18, 1940

